Kopp 3961  
Note: Graph and tabular data at 2.65 mm
Filter Specifications
Transmission for Total Radiation (Illuminant 2854 °K) must be 1.6 ± 0.5%
Minimum Value for Luminous Transmittance (Illuminant 2854 °K) must be 18.6%
Physical Properties
Nominal Thickness Range 2.15 - 2.85 mm
Refractive Index nD = 1.50
Density 2.41 g/cm3
Thermal Linear Expansion 48E-7 /ºC (30-300 ºC)
Strain Temperature 533 ºC
Annealing Temperature 569 ºC
Deformation Temperature 766 ºC
                   
                   
    Kopp 3961  
Wavelength Transmission Wavelength Transmission Wavelength Transmission
(nm) (%) (nm) (%) (nm) (%)
200 0.00 435 27.63 670 8.60
205 0.00 440 28.48 675 7.75
210 0.00 445 29.54 680 6.93
215 0.00 450 30.70 685 6.18
220 0.01 455 31.80 690 5.49
225 0.00 460 32.68 695 4.86
230 0.00 465 33.46 700 4.27
235 0.00 470 34.19 705 3.77
240 0.00 475 34.97 710 3.30
245 0.00 480 35.63 715 2.88
250 0.00 485 36.18 720 2.51
255 0.00 490 36.55 725 2.18
260 0.01 495 36.87 730 1.89
265 0.00 500 37.09 735 1.63
270 0.00 505 37.22 740 1.39
275 0.00 510 37.29 745 1.20
280 0.00 515 37.17 750 1.03
285 0.00 520 36.84 755 0.88
290 0.00 525 36.34 760 0.75
295 0.00 530 35.94 765 0.63
300 0.00 535 35.58 770 0.54
305 0.00 540 35.05 775 0.46
310 0.00 545 34.44 780 0.39
315 0.00 550 33.81 785 0.33
320 0.00 555 33.29 790 0.29
325 0.00 560 32.80 795 0.24
330 0.00 565 32.25 800 0.20
335 0.00 570 31.49 805 0.17
340 0.03 575 30.59 810 0.15
345 0.13 580 29.58 815 0.13
350 0.41 585 28.48 820 0.11
355 1.00 590 27.32 825 0.10
360 1.97 595 26.10 830 0.08
365 3.44 600 24.87 835 0.07
370 5.23 605 23.60 840 0.07
375 7.01 610 22.28 845 0.05
380 9.03 615 20.98 850 0.05
385 11.56 620 19.67 855 0.04
390 14.15 625 18.36 860 0.03
395 16.51 630 17.09 865 0.02
400 18.56 635 15.84 870 0.04
405 20.39 640 14.65 875 0.04
410 21.99 645 13.51 880 0.02
415 23.45 650 12.45 885 0.02
420 24.78 655 11.41 890 0.00
425 25.89 660 10.45 895 0.05
430 26.77 665 9.49 900 0.08